The Goal Zero Yeti 150 Solar Generator 150Wh is designed for use at campsites or festivals. Not only can you charge smartphones with this mobile battery, you can also charge laptops, amplifiers, and other devices. The battery features, among other things, a USB port, a 12v connector, and a socket, allowing you to charge or power almost any device. The Yeti 150 mobile battery also has a handle, making it easy to move.
Note: this power bank doesn't include a USB cable.